1- Always know where the main water shut-off valve is located in case of a leak.
2- Know how to turn off the water heater.
3- Isolation valves located at each fixture will stop the flow of water to that location.
4- Using two wrenches at once turning in opposite directions is
5- called "backing off" and allows the wrench to absorb the stress and not the plumbing.
6- Slip joint pliers can be used to loosen the collar nuts on a drain line.
7- If a supply tube break off is causing a leak, screw in a blind cap to seal off the leak until it can be fixed.
8- Use duct tape or pipe sealing tape to pull together a crack in a pipe, reducing the leak as a temporary solution.
9- When unclogging a kitchen sink, use a second plunger to cover the other drain to get the most force to remove the clog.
10- To unclog a toilet, use a forced cup plunger.